Air-brake.



No. 61255328: Patented may 2s, lem:

IB BRAKE'.

(Application led ,Bsph 10, 1900,)

(Ilo Model.)

@114mm tot s55, WM www,

UNITEDN STATES PATENT lIfEErE.

JAMES GUINAN, OF RICHMOND, CANADA.

AIR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 675,328, dated May 28, 1901.

Application filed September 10, 190i). Serial No. 29,623 (No model.)

To all whom it may concern:

Be it known that I, JAMES GUINAN, a subject of the Queen of Great Britain, residing at Richmond, in the county of Halifax and Province of Nova Scotia, have invented certain new and useful Improvements in Air- Brakes; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in air-brakes, and more especially to an attachment for the auxiliary reservoir; and its primary object is to provide a device whereby the retaining-valves commonly employed are dispensed with.

lThe invention consists in certain features of construction and combination of parts, which will be hereinafter more fully described and claimed, and illustrated in the accompanying drawing, showing the preferred form of my invention, and which is a longitudi-l nal section therethrough.

Referring to the drawing by numerals of reference, 1 is a cylinder which is secured to the bottom of a car or other vehicle, and onehalf of which is of less diameter than the remainder. This cylinder is internally threaded, and the ends thereof and heads 2 and 3 are secured thereinto. The head 3, which is fitted within the large end of the cylinder, is provided with an inwardly-extending stud 4, upon which is mounted a coiled spring 5, which extends beyond the inner end thereof. This spring is in alinement with the center of a piston 6, which is formed, preferably, of two rubber or leather disks 7, separated by expansive rings 8, of spring metal. This piston lits snugly and is adapted to slide within the large portion of the cylinder 1 and is connected by means of a rod 9 to a similar smaller piston 10, snugly tted within the small half of the cylinder. A pipe 11 is arranged without the cylinder and opens thereinto at opposite ends thereof. A flange 12 is arranged within the cylinder at a point adjacent to the end of the pipe 11, within the reduced half thereof, and is for the purpose of limiting the movement of the pistons in one direction. A cock 13 is provided within the cylinder at a point adjacent to the center thereof and is for the purpose of detecting leakage past the pistons. A supply or train pipe 14 opens into the cylinder at a point between the flange 12 and the head 2, and the pipe 15 connects the opposite end of the cylinder to the auxiliary reservoir 16.

When air is forced into the cylinder through the supply 14:, the piston 10 will be forced away from the inlet to pipe 11 and will cause the pistons 6 to contact with the spring 5. Air will then pass from pipe 14 into pipe 11 and thence, between piston 6 and cap 3, up into the reservoir 16 by way of pipe 15. When the pressure within the reservoir becomes equal to that within the pipe 14E, the piston 6 wi-ll be forced away from spring 5 in view of the fact that it is of greater diameter than piston 10. This movement will cause the piston 10 to close the inlet to pipe 11.

In the foregoing description I have embodied the preferred form of my invention, though I do not wish to be understood as limiting myself thereto, as I am aware that modications may be made therein without departing from the spirit or sacrificing any of the advantages of this invention, and Itherefore reserve the right to make such changes as fairly fall within the scope thereof.

Having thus described the invention, what is claimed, and desired to be secured through Letters Patent, is

1. The combination with an auxiliary reservoir; of a cylinder communicating therewith at one end, an air-supply pipe at the opposite end of the cylinder, a pipe connecting the ends of the cylinder, and connected pistons of different diameters within the cylinder, one of which is adapted to close the outlet from the inlet end of the cylinder.

2. The combination with a cylinder of varying diameters g of heads detachably secured within the ends of the cylinder, an inwardlyextending stud upon one of theheads,a spring mounted thereon, connected pistons of different diameters slidably mounted within the cylinder, a pipe connecting the opposite ends of the cylinder, the inlet thereof being adapted to be closed by one of the pistons, an airsupply adjacent to the small piston of the IOO all

cylinder,and an auxiliary reservoir connected to the opposite end of said cylinder.

3. The combination with a cylinder of varying diameters; of connected pistons of different diameters slidably mounted therein, an inlet to the cylinder adjacent to the smaller piston, a pipe connecting the ends of the cylinder, the inlet to said pipe being adapted to be closed by the small piston, an outlet from the cylinder adjacent to the large piston therein, and means for holding said piston normally removed from the outlet.

4:. The combination with a cylinder of varyingdiameters; of heads detachablysecured rod connecting the pistons, a pipe connecting the opposite ends of the cylinder, the inlet thereof being adapted ,to be closed by the small piston,an annular flange within the cylinder and in the path ,of the small piston, a valve-outlet Within the cylinder and be'- tween the pistons, an air-supply to the cylinder adjacent to the flange, and an auxiliary reservoir connected to the opposite end of said cylinder, the large piston being nor'- mally removed therefrom.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES GUINAN.

Vitnesses:

THos. W. WALSH, WILLIAM J. LEAHY. 

